The word energy comes from ancient Greece. This may be the first time it appeared in Aristotle’s works in the 4th century BC. In the International System of Units (SI), the unit is JOULES, named after JOULES. It is a derived unit. It is equal to that consumed (or work done) by applying a force of one newton through a distance of one meter.

Energy movement









In physics, the ability to do work. It can exist in potential, kinetic, thermal, electrical, chemical, nuclear or various other forms. In addition, there is heat and work-that is, the process of transferring it from one body to another. After it is transferred, the energy is always specified according to its nature. Therefore, the heat transmitted may become thermal, and the work done may be expressed in the form of mechanical.


There are many different forms, including

* Nuclear energy is the type trapped inside each atom. In nuclear can be produced by fusion (binding atoms) or fission (splitting atoms) processes.

* Thermal energy is the type a substance or system related to its temperature, that is, the one used in moving or vibrating molecules. For example, we use solar radiation to cook food.

* Mechanical energy is that which a substance or system has because of its movement. For example, a machine uses the mechanical form to do work.

* Electrical energy is the form carried by moving electrons in an electrical conductor. It is one of the most common and useful forms. For example- lightning. Other forms are also converted into electrical. For example, power plants convert chemical stored in fuels such as coal into electricity through various changes in its form.

* Chemical energy is the type stored in the bonds of chemical compounds (atoms and molecules). Chemical energy is released in chemical reactions, usually in the form of heat. For example, we use it by burning wood, coal and other fuels.

* Gravitational energy refers to that held by an object in the gravitational field. Examples include water flowing down a waterfall.



The two general types used for doing work:

  • Potential or It’s stored form
  • Kinetic or It’s working form


There are many different sources, which can be divided into two basic categories:

* Renewable form that can be easily replenished

* Non-renewable form, cannot be easily supplemented

Renewable and non-renewable sources can be used as primary sources to generate useful form such as heat, or they can be used to generate secondary sources such as electricity and hydrogen.


For Kinetic

K.E = ½MV2

Where K.E = Kinetic energy

M = mass in kilograms

V = velocity of meters per second


For Potential

P.E = mgh

Where P.E = Potential Energy

M = mass in kilograms

g = acceleration due to gravity

h = height in meters

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